Heat-exchanging apparatus



March 1 5 1927.

W. YATES ET AL HEAT EXCHANGING APPARATUS Filed Feb. 15. 1924 III Patented Mar. 1, 1927.

UNITED STATES WALTER YATES AND SYDNEY YATES, OF

SWINTON, NEAR MANCHESTER, ENGLAND.

HEAT-EXCHANGING APPARATUS.

Application filed February 13 1924, Serial No This invention relates to heat exchanging apparatus and more particularly to apparatus of the type in which a fan rotor propels air through heating means disposed within the fan casing and has for its object to obtain a higher fan efficiency combined with a more effective heating of the air, than has hitherto been possible.

The invention comprises the improved combination and arrangement of parts hereinafter described and claimed.

The invention is clearly illustrated in the accompanying drawings, in which Fig. 1 is a part side elevation and part sectional elevation of a fan type heat exchanging mechanism constructed in accordance with the present invention, and

Fig. 2 is a part front elevation and part sectional front elevation of the arrangement shown in Fig. 1.

The air leaving the periphery of the fan rotor or propeller a, instead of passing directly through the heater, is passed through volute paths 6 provided by the partitions 0 arranged around the fan rotor. The said volute paths transform the air velocity into pressure. The air leaving said volutes b is caused to pass through the heating means into a further volute path formed adjacent the peripheral wall of the fan casing d. The heating means may consist of steam pipes e or any other convenient apparatus. For example, the steam pipes 6 may encircle the fan with its volutes b, and gill plates f be provided on said pipes, the said plates being set parallel with the general direction of flow of the air as it passes over the plates to facilitate the passage of the air over the pipes on its way to the fan delivery outlet g. It will be understood that the gill plates extend the full length of the pipes e. The lower part of each steam pipe may be connected to a drain pipe 71 for water of condensation. Steam enters the pipes by the connections 2'.

It is to be understood that by arranging the heating pipes e concentrically of the fan rotor but eccentrically of the peripheral wall of the casing a that the outer volute is thereby provided between the pipes e and the inner surface of the said peripheral wall 692,553, and in Great Britain January 18, 1924.

of the casing. It will thus be seen that as the air is force-d through the inner volutes between the partitions c a part of the kinetic energy imparted thereto by the fan is converted into pressure energy. The said con version is completed after heating the air within the outer volute partly defined by the peripheral wall of the fan casing.

By providing the heating means on the delivery side of the volute or volutes 1) around the fan rotor 11 but within a volute within the fan casing, we find that we obtain a greater fan efficiency and a more effective heating of the air delivered by the fan than is obtainable with heaters of similar. type in which the air is heated'as it leaves the fan rotor.

We claim 1. A heat exchanging apparatus comprising a fan casing, a fan rotor mounted therein, partitions about the rotor defining volutes therearound, each volute extending approximately a third of the distance about the rotor, air heating means disposed around said partitions including plates extending substantially parallel with the general direction of flow of the air from the rotor, said means being positioned eccentrically with respect to the peripheral wall of the casing so as to provide another volute through which the air passes prior to passing from the casing.

2. A heat exchanging apparatus of the character described comprising a fan casing having a central inlet and a peripheral outlet, a fan rotor within the casing, a plurality of spaced partitions arranged about the rotor and defining volutes thereabout, circu lar heating pipes arranged about the partitions and having gill plates thereon arranged parallel to the general direction of flow of the air, said pipes being positioned eccentrically with respect to the peripheral wall of the casing so as to'provide another volute between the said pipe and the said peripheral wall through which air is passed prior to being forced from the casing.

3. A heat exchanging apparatus comprising a fan casing, a fan rotor mounted therein, partitions about the rotor defining vou s illewero n i a r heat n me n disposed around said partitions and positioned ing action is produced on the air between eccentrically with respect to the peripheral the partitions and the heating means.

wall of the casing, the distance between the In testimony whereof we have signed our 1 outer end of one partition and the inner end names to this specification.

of the next one being greater than the distance between the outer end of each parti- WALTER YATES.

tion and the heating means whereby a wedg- SYDNEY YATES. 

